Purna Yoga Helsinki (http://www.purnayoga.fi/en/index.html) has regular classes in English. If there is at least one english-speaking student, the class will be thought in English, if I remember correctly.

The teacher is also one of Finland's best, she brought Ashtanga to Finland, although she teaches Purna Yoga now.

I am teaching yoga in English (iyengar yoga) since many years. www.joogasofi.fiMondays and Fridays 9.45-11.00 at the Alexander Theater, Studio YamaThe studio has all the equipment like yoga mats and so on.